66206291 has 2 divisors, whose sum is σ = 66206292. Its totient is φ = 66206290.

The previous prime is 66206281. The next prime is 66206311. The reversal of 66206291 is 19260266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66206291 - 2⁶ = 66206227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66206281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33103145 + 33103146.

It is an arithmetic number, because the mean of its divisors is an integer number (33103146).

Almost surely, 2^66206291 is an apocalyptic number.

66206291 is a deficient number, since it is larger than the sum of its proper divisors (1).

66206291 is an equidigital number, since it uses as much as digits as its factorization.

66206291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 66206291 is about 8136.7248325109. The cubic root of 66206291 is about 404.5446103298.

The spelling of 66206291 in words is "sixty-six million, two hundred six thousand, two hundred ninety-one".